This button most likely refers to the Freedom to Read Protection Act of 2003. In 2001, President George W. Bush signed into law the Patriot Act in an effort to monitor and obstruct potential terrorist activities. Part of this Act allowed the federal government to access individuals’ library records and purchases at book stores. Rep. Bernie Sanders introduced the Freedom to Read Protection Act, arguing that monitoring what people read was unconstitutional, as it violated citizens’ right to privacy.